300BlkTalk

Back on topic: This is a thing that drove be bonkers wayyy back when I first started loading. OAL measurements. Have ya ever got yer seater set up "dead nuts on" to a specific measurement, then loaded a few rounds and checked them only to find OAL's all over the place? The seater's fine, ...

Yes, I clearly have more reading to do, at least on this round. I've never had the difficulty with my other calibers that I have had with this. The bad headstamp was MAST. And yes, I considered neck turning hundreds of pulled rounds, but I'm thinking the recycling bin is the proper home for these. T...

I didn't see this on the list, but the MAST headstamp is definitely bad. Unfortunately, I loaded 100s of them before discovering this (and this thread).

Wow. I see. The chubby round never had a chance.

I've got some more reading to do, and a lot of measuring of my inventory. I'm surprised I haven't run into this before now.

Thanks all for the help!!!

Neck diameter is .339 to .340.

There are a couple reasons that could cause your round to go click. dellet beat me to the first one. I won't confuse you with the rest as we need to handle the first. Do you have a way to measure bullet base to ogive? If not , can you determine if bullet is engaging the rifling. It might be a good ...

Buy a Sheridan "cutaway" case gauge. It will show you the error of your ways. Just did. Thanks for the advice. The load data I'm using, albeit from multiple sources, is almost certainly wrong. Maybe I don't have the bullet I think I do, though I don't see data for any 180 gr bullet that i...

What exact bullet are you using? Sounds like it is not the one used in the data you got the length from. What is loaded neck diameter? It appears to be a Hornady Interlock 180gr. It may be something slightly different, as my records indicate this was a Midway Blem purchase. It looks like the pics o...

This is one I haven't encountered before. I'm loading 180 gr BTSP 300BLK cartridges. Hodgdon and other references say to set at 2.21" COL or very close to that (Speer says 2.18"). This puts the case edge well short of the cannelure, but I don't think that matters (which could be one of my ...

All the loads I tried were with Lil Gun. The 147 gr factory ammo, while not quite as heavy as the 168 BTHP, functioned perfectly. I've got to think it's something about the rounds themselves. Factory ammo of any weight / brand has never malfunctioned in that gun. I made up two more test batches (5 e...