Different primers question

[DallyB09]

I found a load that my rifle really likes.

56 gr H1000
Berger 156 eol
CCI LRP primers

Problem is I can’t find anymore primers

I did get a box of Winchester LRP. Do I just load em and go? Or do I need to re “work” this load”

 

[Harvey_NW]

IME, different primers may move the avg velocity needle a little bit. Otherwise, I've never seen a noticeable effect on precision with decent sample sizes. If that charge is near pressure signs it may be worth shooting a quick pressure ladder to make sure it isn't too spicy with a new primer. Then I would load 10 up at a safe charge and go shoot a group over a chrono to check velocity data. If you don't have one just shoot the 10 to make sure it's acceptable and load the rest and true up at distance.

 

[jfk69]

^^This^^

It can have an influence. If your near max load better safe than sorry.

 

[Axlrod]

I have been seeing large rifle primers pop up quite a bit. First place I checked just now has CCI 200's:

Natchez

www.natchezss.com

 

[wapitibob]

When I tested primers I changed nothing but the primer.

 

[DallyB09]

^^This^^

It can have an influence. If your near max load better safe than sorry.

I am a full grain off pressure signs

 

[06 SB]

Winchester LRP are much hotter than CCIs. ALWAYS work up loads. As an example with these two primers, I have a 338Fed and always used CCI LRPs with IMR4895. I was looking for a little more consistent velocities so I bought a sleeve of Win LRPs. I reduced the load from 47gr to 45 figuring that was enough. The 45gr load was hot to include a stiff bolt lift, flat primer and ejector marks. I just stayed with CCIs.

 

[Lawnboi]

CCI Large Rifle Primers #200 Box of 1000

CCI Large Rifle Primers #200 Box of 1000 at Target Sports USA with free shipping available. Enjoy deals on 12 ammo and primers for sale o|^||^|

www.targetsportsusa.com

 

[WeiserBucks]

I am a full grain off pressure signs

It's not gonna blow up in your face. Load a couple and watch for pressure, back it down if needed.

 

[A382DWDZQ]

For changing lots of poweders, brass, bullets and primers, I like the method where you don’t wait until you run out, and then you load a backed off load with the current components and a backed off load with only the new component, and see if those line up on velocity, or what the difference is. Then, if I feel necessary, I’ll do pressure ladder, or if not, duplicate the normal load and see how it shoots/chronos.

 

[Castle Rock]

Winchester LRP are much hotter than CCIs. ALWAYS work up loads. As an example with these two primers, I have a 338Fed and always used CCI LRPs with IMR4895. I was looking for a little more consistent velocities so I bought a sleeve of Win LRPs. I reduced the load from 47gr to 45 figuring that was enough. The 45gr load was hot to include a stiff bolt lift, flat primer and ejector marks. I just stayed with CCIs.

That wasn’t the primer, something else was going on

 

[Harvey_NW]

That wasn’t the primer, something else was going on

I've had the exact same thing happen from just switching a primer.

 

[Lawnboi]

Winchester has had a poor track record in recent years with primers fwiw. Proceed with caution.

If a primer change is causing issues with your load your probably on the heels of pressure to begin with. If I’m switching I just do a few and see, but I’m also not .2 grains from pressure.

 

[EdP]

Plenty of CCI-200's available from internet sale sources. Look on Ammoseek.com. Buy what you need for the next 10-15 years and be done with it.

 

[35WhelenAI]

Not a rifle, but did a primer test with my S&W 329PD (44 Mag). Winchester large pistol primers average 1029 FPS with a specific load. The same load with CCI large pistol primers was 1079, Federal large pistol primers averaged 1092. WLP load was what I had worked up, the others were slightly tight on ejection. Not as much margin with a smaller handgun case for error, but that's a notable difference in changing primers and pushed the load past the point of proper function.

 

[Castle Rock]

Not a rifle, but did a primer test with my S&W 329PD (44 Mag). Winchester large pistol primers average 1029 FPS with a specific load. The same load with CCI large pistol primers was 1079, Federal large pistol primers averaged 1092. WLP load was what I had worked up, the others were slightly tight on ejection. Not as much margin with a smaller handgun case for error, but that's a notable difference in changing primers and pushed the load past the point of proper function.

So literally a 1% variation from the highest to lowest
In other words statistically irrelevant

 

[GIS]

I would rework to be safe. I recently switched lots for both primers (GM210) and powder (H1000) for my 6.5 PRC load and had to add 1 grain of powder to get back up to the same velocity. It very easily could have been the other way where I needed to reduce by 1 grain and would have been way over pressure had I loaded the same.

Sent from my SM-S926U using Tapatalk

 

[35WhelenAI]

So literally a 1% variation from the highest to lowest
In other words statistically irrelevant

Double check your math, you come across as one who is on his game, giving you a shot to check the numbers. Share your corrected percentage and apply it to a 3000 fps rifle load. Not saying that's what it would be on the rifle load, but it puts in perspective primers are a legitimate and relevant variable.

 

[Harvey_NW]

So literally a 1% variation from the highest to lowest
In other words statistically irrelevant

I got a 162fps increase from avg in a 28 Nosler by switching from a CCI 250 to a Fed 215. I almost forgot about that but I made a post about it when it happened. But that's the worst I've ever seen, or heard of.

 

[35WhelenAI]

So literally a 1% variation from the highest to lowest
In other words statistically irrelevant

Check the numbers, not 1%... 6.1%. .. On a 3000 fps load that is 183 fps.

I got a 162fps increase from avg in a 28 Nosler by switching from a CCI 250 to a Fed 215. I almost forgot about that but I made a post about it when it happened. But that's the worst I've ever seen, or heard of.

My 183 fps extrapolated on a 3000 fps load is not far off what you got.