Small vs large primer

[Trueblue]

Trying to get components together for a 6.5 Grendel AR build, and see that different brass companies have different size primer pockets.
Starline used to have small pockets, but now are large primer pockets. Lapua is small primer pockets.
Does it make any difference on load accuracy between small or large, or just buy what is available?

[Jakal]

You have to use large primers in large primer pockets and small primers in small primer pockets.

Do not mix the 2. If your brass has both sizes, then buy both sizes of primers.

A small primer in a large primer pocket will fall out. Trying to get a large primer into a small primer pocket may cause a slight explosion.

Many different thoughts on the accuracy question. Lapua uses small flash holes due to cold weather. Supposed to transfer a more consistant, hotter flash due to the narrow flash hole. Thus better accuracy.

More powder usually wants a bigger primer, Wolf uses large primers. Some Wolf shoots great other Wolf, not so much. Not sure of the PPU brass.

I think the flash hole and pocket size should be standardized.

[hill37]

What makes you think Starline uses large primers? Their web sight still says small rifle primers. Starlines flash hole is .080" .Lapua is the only Company that I know that uses a .060" flash hole. PPU and maybe Wolf are the only Grendel brass that used large rifle primers that I know of. Wolf steel uses Berdan (European type).

[Trueblue]

What makes you think Starline uses large primers? Their web sight still says small rifle primers. Starlines flash hole is .080" .Lapua is the only Company that I know that uses a .060" flash hole. PPU and maybe Wolf are the only Grendel brass that used large rifle primers that I know of. Wolf steel uses Berdan (European type).

I guess I assumed that since Lapua is 0.060 flashhole that a 0.080 was a large primer size flashhole.
So, they are both small primer pocket, correct.

[cwlongshot]

I just bought 200 Star line Grendel brass...its SRP sized.

Its new stock, as this supplier said new into him about a month back...

So maybe some, but surely not all.

CW

[mdewitt71]

I guess I assumed that since Lapua is 0.060 flashhole that a 0.080 was a large primer size flashhole.
So, they are both small primer pocket, correct.

Flashhole size is not Primer size......
ALL Starline 6.5 Grendel is for Small Rifle Primer size and Yes, it has a larger flash hole that Lapua or other brands.
There is no plan for large primer for 6.5G; at least not being made since I was there this weekend.

[Trueblue]

Got it, thanks.
For some reason I was having a brain f$rt day.
Been reloading for over 10 years, not sure why I got confused on this one.

[drykilned]

Trueblue, I been reloading since 1963 and occasionally still have brain f$arts!. I do have the excuse of old age, tho!

[Popeye212]

Trueblue, I been reloading since 1963 and occasionally still have brain f$arts!. I do have the excuse of old age, tho!

I got your back on that one. Seems they get more frequent than I would like....