dumb question on bullet grain

[cruzans]

So, I took my new TNW 45 acp pistol out today for the first time. I started with some 230 grain fmj and it jammed every time. The spent round ejected fine, but the new round would get hung up. I was bummed and about to give up when I remembered I had some different ammo with me. I had an old box of UZI 185 grain hollow points. I loaded those, and no issues at all ! So, my ignorance, would the lower grain bullet be something that this gun just likes - i.e. finicky ammo gun, or would that not make the difference and it might have been something else ? I emailed the company to see if they could shed any light. Thanks!

[jakebrake]

is it a ramped barrel? try different mag?

[knight0334]

It is probably the ogive of the bullet, not so much the weight, if it is a feeding problem.

There are lots of guns that do not like truncated profiles, some that do not like flatnose, some that do not like hollow points.

[cruzans]

Yeah, that's why I was surprised that it would not cycle standard fmj ball but had no issues with hollow points. Didn't know if weight might have something to do with it ? Guess I'll keep trying and see what manufacturer has to say. Thanks!

It is probably the ogive of the bullet, not so much the weight, if it is a feeding problem.

There are lots of guns that do not like truncated profiles, some that do not like flatnose, some that do not like hollow points.

[cruzans]

Takes Glock 21 mags - as far as I know, that's the only mag that will fit. I'll keep trying different ammo until I hear back from them. Thanks!

is it a ramped barrel? try different mag?

[noylj]

It's a NEW gun-stiff springs and may be tight. Give it a good lube and break it in with at least 200 rounds and then worry about it.
After that, the magazine is most likely the problem.

[Hokkmike]

Could it be the higher velocity of the lighter bullet produces more gas on ignition?

[cruzans]

Thanks. I'm sure it will take some break in - was just baffled that the fmj jammed every time and the hp fired every time ? Going to keep breaking her in

It's a NEW gun-stiff springs and may be tight. Give it a good lube and break it in with at least 200 rounds and then worry about it.
After that, the magazine is most likely the problem.

[cruzans]

That was what I was trying to figure out, not sure if it make sense? Thanks!

Could it be the higher velocity of the lighter bullet produces more gas on ignition?

[bigdawgbeav]

could be the OAL of the round...