Thanks wilds. I thought it was a wild turkey night for the fella.

Can you tell me what cases, bullets, dies, loads, and rifle you are using?

CASE: Winchester
BULLET:Sierra SP, 87 gr.
DIES: RCBS
LOAD: 41.0 grs. IMR 4895
VEL: 3372 fps. (average)
RIFLE: Win. Model 70

What was the air temp?

Mid Eighties

Were the cartridges in the sun?

No, benches are under an overhang at the range.

Can you tell me how to prepare new cases because we screwed some up one time.

Checked OAL, ran cases through resize die, trimmed inside neck for bullet.

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Hope this helps, Dan. All my WSSM and WSM cases have been Winchester brand. I guess I willtry some other brands. I just thought they would be the best, nostly because I haave never had any problems in the past with this brand of cases.

Do you mean deburred inside neck? Or did you thin inside neck with a reamer?

Hmmm, didn't think I had to explain that one!

Never heard it put that way of "trim the inside of the neck". Sorry if I offended. Just trying to offer advise. If you got it figured out, I understand.

If you ran an inside neck reammer in the brass you actually could have made the problem worse!! If you took .001 - .003 more and made theneck wall thinner,then when it squezzes it down it will make more of a gap between the outside and the neck area of the barrel..for that matter don't even take any off the out either..it'll just make more of a gap also...just partially size the neck and see what happens...

I don't think he realizes what inside neck reaming is. Or maybe thats what he is going?

.............Interesting....I used to do some inside neck REAMING.....USED to...

FACTORY cut chambers already have to much slop in the the neck area and for the most part the rifles aren't accurate enought to make cleaning up the necks worth your time... I get a chance to see everything in the world shoot at our long range groundhog match, 200-300-500 yards, being the range master I get real nosey sometimes...and believe me for the most part there's not much you can do when the chambers are cut so sloppy..my custom Borden built rifle has .261 and about a quarter on a .262 cutting...the cases last forever because they don't move very much..I have over 2500 rounds on 40 cases and they shoot the same today as they did when the are new..YES, inside and outside neck reamming can help rifles become more accurate but if the chamber has that much clearance, it's not worth the time and effort...and if you straighten out the necks you'll be actually making more of a gap and causingmore movement...good luck, try partial neck sizing, they'll look funny becuase you'll actually see swelling but I'll bet they'll shoot better and last alot longer..

When we ream out the inside of the neck, we are talking about a process to put a slight bevel to the inside neck lip and removes any burrs and thenaids the bullet during seating. This is done because we don't bell our necks for rifle cases like we do for handgun cases.

I don't knowof anyonethat reams out the neck area during the reload process. Maybe this was misunderstood.