7PRC Partition wont chamber

[V00D00]

I had a 300wsm tikka t3x built into a 7prc by a smith ive used before with great results.
Tikka t3x action
hells canyon magazine (3.410 coal)
proof research 18" carbon blank
triggertech diamond trigger
manners lrh-tk stock
hells canyon la bolt stop

just got the rifle back, looks phenominal. couldnt be happier.

anyways.. he shipped the rifle with 2 pieces of hornady brass, both with I happened to notice showed ejector marks and flat primers.

I mainly hunt with a nosler partition. during the summer i play around with eldm, nosler rdf on paper and steel. (this is exactly what i stated to the smith when i sent off the rifle via text. he replied (ok)

so i just got the rifle back, i loaded a 175gn nosler partition at saami (3.340 coal) bolt stops before it even begins to turn. i pull bolt back. bullet and case are still together but i have to put cleaning rod down barrel to knock it out of chamber.
I then look up noslers load data and see in their load data they used a coal of 3.260 so i load a 3.55 and same thing. wouldnt go. bolt wouldnt even begin to turn. cleaning rod it is.
so i grab the fired hornady case that he sent with the rifle and it chambers.
so to rule out me creating a problem when resizing the case i loaded a round with a coal of 3.334 with a new piece of adg that was never resized and again it wouldnt chamber. again cleaning rod.
so to rule out a problem with the batch of adg i loaded 3.334 in a piece of hornady brass once resized. wouldnt go. cleaning rod.
then i load a 3.260 in a brand new piece of unsized adg just for shits and giggles. no go.
and of course a new piece of adg brass with no bullet will chamber.

im pretty sure the ogive is hitting the lands and stopping the bolt. its a firm stop. couldnt force it even if i wanted to. im also pretty sure if i load a 3.1 something that the partition will probably chamber. but to me its seems that putting the bullet that far into the case will raise pressure, and ill end up losing more speed when i have already given up some speed due to the barrel length (suppressor)

i called the the smith, and dude was easy to talk to. basically said its the ogive which i suspected. said it can be reamed but i need to make a choice between partitions and newer style bullets like eldx, eldm, bergers etc. and that may be true. but ill say that i never had to make that choice before with any other caliber.

anyways..im waiting on a modified case to see exactly where the lands are at. and ill load a partition to see exactly where it will chamber. and i have a friend who will drop off a few other bullets for me to try to chamber so i can get a feel of where im at. but i just wanted to run this by you all to get your thoughts and opinions and see what you all would do before i do anything. ill add some pics

 

[WeiserBucks]

I'd take it to the smith and ask him to call me when it was ready to be put into service.

 

[V00D00]

I'd take it to the smith and ask him to call me when it was ready to be put into service.

hmm. u think he trying to get one over on me?

 

[WeiserBucks]

hmm. u think he trying to get one over on me?

No, but it's his job to deliver a rifle that meets your expectations as agreed.

 

[V00D00]

No, but it's his job to deliver a rifle that meets your expectations as agreed.

i think hes willing to do whatever i want. but im not sure what the right thing to do is just yet. but he is saying that if he reams where the partition will chamber at say 3.4 the other bullets will have so much jump and those bullets usually like to be close to the lands. at least thats what i had gathered from the few mins i spent on the phone with him this morning but the wife does say sometimes i dream shit up lol

 

[WeiserBucks]

Saami spec is 3.34, every 7mm bullet known to man should chamber at 3.34

 

[Pickettpuncher]

If nosler used 3.260 I’d probably try that. Or get a comparator. Or an empty brass to rule out everything but the length.

 

[S.Clancy]

I would try to chamber an empty brass first.

Edit: I re-read and it seems like you did chamber a piece of unfired, brand-new brass just fine. Something sounds messed up, I would send it back to him.

 

[WeiserBucks]

If nosler used 3.260 I’d probably try that. Or get a comparator. Or an empty brass to rule out everything but the length.

I would try to chamber an empty brass first.

Did you guys even read the 1st post?

 

[S.Clancy]

Did you guys even read the 1st post?

See above, I missed that part at the bottom of the paragraph.

 

[wapitibob]

The smith is feeding you a line of bs about partitions and eld's; any of them will chamber in a SAAMI chamber. The 7PRC is designed with freebore for the long 7's, a partition will chamber with tons of room to spare; excessively so.

 

[streamerfish]

It sounds like he used some kind of custom reamer.

Its a 7 PRC, just have him give a standard SAAMI reamer job. It will shoot whatever you want to shoot. It will shoot bergers and partitions just fine.

I wouldn't stress over bullet jump at all. I would be more worried about being too close then too far away....

 

[Pickettpuncher]

Did you guys even read the 1st post?

Did you guys even read the 1st post?

Sure, I just stated what I would check first narrowing down the issues. Also, doesn’t help I’m between concrete trucks and asphalt trucks.

 

[V00D00]

If nosler used 3.260 I’d probably try that. Or get a comparator. Or an empty brass to rule out everything but the length.

i tried 3.255 both in a resized case and a new case not resized. no go. and empty brass will chamber with no bullet. both resized and new

 

[Judd]

Just keep pushing the partition into the case until it chambers...the OAL is too long and the bullet is hitting the lands. What I'd do...throw the 1960's technology in the trash and get the 175 EOL or 175 ELDx and shoot those

 

[Pickettpuncher]

i tried 3.255 both in a resized case and a new case not resized. no go. and empty brass will chamber with no bullet. both resized and new

Keep seating it deeper until it fits.

 

[mtnbound]

I had a 300wsm tikka t3x built into a 7prc by a smith ive used before with great results.
Tikka t3x action
hells canyon magazine (3.410 coal)
proof research 18" carbon blank
triggertech diamond trigger
manners lrh-tk stock
hells canyon la bolt stop

just got the rifle back, looks phenominal. couldnt be happier.

anyways.. he shipped the rifle with 2 pieces of hornady brass, both with I happened to notice showed ejector marks and flat primers.

I mainly hunt with a nosler partition. during the summer i play around with eldm, nosler rdf on paper and steel. (this is exactly what i stated to the smith when i sent off the rifle via text. he replied (ok)

so i just got the rifle back, i loaded a 175gn nosler partition at saami (3.340 coal) bolt stops before it even begins to turn. i pull bolt back. bullet and case are still together but i have to put cleaning rod down barrel to knock it out of chamber.
I then look up noslers load data and see in their load data they used a coal of 3.260 so i load a 3.55 and same thing. wouldnt go. bolt wouldnt even begin to turn. cleaning rod it is.
so i grab the fired hornady case that he sent with the rifle and it chambers.
so to rule out me creating a problem when resizing the case i loaded a round with a coal of 3.334 with a new piece of adg that was never resized and again it wouldnt chamber. again cleaning rod.
so to rule out a problem with the batch of adg i loaded 3.334 in a piece of hornady brass once resized. wouldnt go. cleaning rod.
then i load a 3.260 in a brand new piece of unsized adg just for shits and giggles. no go.
and of course a new piece of adg brass with no bullet will chamber.

im pretty sure the ogive is hitting the lands and stopping the bolt. its a firm stop. couldnt force it even if i wanted to. im also pretty sure if i load a 3.1 something that the partition will probably chamber. but to me its seems that putting the bullet that far into the case will raise pressure, and ill end up losing more speed when i have already given up some speed due to the barrel length (suppressor)

i called the the smith, and dude was easy to talk to. basically said its the ogive which i suspected. said it can be reamed but i need to make a choice between partitions and newer style bullets like eldx, eldm, bergers etc. and that may be true. but ill say that i never had to make that choice before with any other caliber.

anyways..im waiting on a modified case to see exactly where the lands are at. and ill load a partition to see exactly where it will chamber. and i have a friend who will drop off a few other bullets for me to try to chamber so i can get a feel of where im at. but i just wanted to run this by you all to get your thoughts and opinions and see what you all would do before i do anything. ill add some pics

What’s the OAL of the round in the picture?

 

[V00D00]

Keep seating it deeper until it fits.

I went down to 3.

What’s the OAL of the round in the picture?

3.340

 

[V00D00]

Update. Got home this evening after borrowing a few 7mm bullets from a friend.
I loaded 162 gn Hornady sst @ 3.337 - wouldn’t chamber
I loaded 150 gn sierra matchking at 3.268- wouldn’t chamber
I loaded 140 gn Barnes ttsx - wouldn’t chamber
I loaded a 185 Nosler rdf at 3.439- wouldn’t chamber.

So then I decided to reload all these at their book length from their manufacturers book data.

So I loaded 162 Hornady sst at 3.070,
I loaded a 150 gn match king at 3.100
I loaded a 140gn Barnes ttsx at 3.110
And I loaded a 185 Nosler rdf at 3.320

I can get these to chamber if I force them. The rdf was so rough that it seated the bullet to 3.317.

Most importantly I’m noticing to chamber any of these bullets even a lil shorter than book length in order to get them to chamber when the bolt should rotate I’m having to force the bolt further I’m assuming jamming the bullets into the lands and I can feel the extractor snap over the case rim and then the bolt will rotate down. I have other tikkas and I went grab all of them and none of them have this phenomenon. Or feeling. What say you?

 

[streamerfish]

Update. Got home this evening after borrowing a few 7mm bullets from a friend.
I loaded 162 gn Hornady sst @ 3.337 - wouldn’t chamber
I loaded 150 gn sierra matchking at 3.268- wouldn’t chamber
I loaded 140 gn Barnes ttsx - wouldn’t chamber
I loaded a 185 Nosler rdf at 3.439- wouldn’t chamber.

So then I decided to reload all these at their book length from their manufacturers book data.

So I loaded 162 Hornady sst at 3.070,
I loaded a 150 gn match king at 3.100
I loaded a 140gn Barnes ttsx at 3.110
And I loaded a 185 Nosler rdf at 3.320

I can get these to chamber if I force them. The rdf was so rough that it seated the bullet to 3.317.

Most importantly I’m noticing to chamber any of these bullets even a lil shorter than book length in order to get them to chamber when the bolt should rotate I’m having to force the bolt further I’m assuming jamming the bullets into the lands and I can feel the extractor snap over the case rim and then the bolt will rotate down. I have other tikkas and I went grab all of them and none of them have this phenomenon. Or feeling. What say you?

Again....its not reamed properly. Simple as....Have him redo it to proper specs.