180 Hybrid Trouble

[Ryanjac23]

Finally joined the forum, have been a part of many others in the past. Glad to be a part of it.

I’m having trouble with my 7PRC shooting 180 hybrids. I loaded up several today and accuracy was 1.25-1.5”+. It’s all over the place. Went back to Hornday factory ELDMs and it shot .5” no problem like usual. Load specs below:

-ADG Brass
-66.5 to 69 gr Retumbo
-180 hybrids
-3.34” COAL.

At 3.34” it is jumping a ways…I seated a few at 3.37 but that certainly did not help.

Gun is custom built…22” proof barrel, Definace action…etc. 100 rounds down the tube total.

I know guns are certainly temperamental at times…but to shoot .5” groups with factory ELDMs and then blow up to 1.5”+ with a Berger seems like I’m missing something big. I’ve shot Bergers a decent amount and have always been impressed by them…just seems like I’m missing something here. Any thoughts?

 

[hdc77]

My 7 PRC did not like
Retumbo, 64.5 gr H4831SC, CCI 250 loaded long, CBTo 2.560 on ADG brass shot one hole groups.
I’d change powder first, as usual proceed with caution as all rifles are not the same

 

[eoperator]

My 7prc didnt love 180hyb, 175eh and n565 on the other hand shoot very well.

 

[Don Qui Puncher]

I don’t have a PRC but recently got a saum and it shoots the 180’s really well, I’ve tried 2&3 thou off the lands and both shot great. Try seating some .002 off the lands and see if that gets you anywhere. I’ve always had luck shooting bergers close to touching

 

[doverpack12]

Looking for a bigger accuracy jump in a rifle capable of very good accuracy will have to come with a powder or bullet change.

 

[wind gypsy]

Agree with the folks saying try a different powder. H1000, n565 or n570 would be some options. Or, just stick with ELDs.

 

[doc holiday13]

H1000 isn't the fastest powder but it seems to be the most predictable and lends itself to accuracy.

 

[wapitibob]

H1000 and 180 hybrids sucked for me.
I had better things to do then try to force feed it so I went to 195's and N570. About 1 moa with a 7gr spread, pressure test. Done and verified to 1,000 in less than 30 shots.

.020 off
70.2gr N570
215's