short cycle with AR-15 with ramshot tac powder and 40gr bullet

[300 RUM]

Any one have problems using Ramshot powders? I am getting a short cycle with AR-15 with ramshot tac powder and 40gr bullet? any ideas???

 

[navyrad8r]

300 rum,
How much are u using? Tac is a great powder for the .223, a little dirty but used it with 77 gr smks with great success. Without looking at my books I wanna say 25 gr, cci reg primer and 40 gr varmit grenades worked quite well on prairie dogs...
Let me check the books tonight.
Cheers,
Doc

 

[300 RUM]

I want to say maybe 26gr with the 40gr V-Max. Everything seems to OK, gas tube,the rifle is clean, gas rings look good etc???

 

[300 RUM]

You know what, I may be trying to shot "neck sized only" brass. If thats the case it will short cycle. I bet I have my ammo mixed??

 

[navyrad8r]

i think you might be onto something...if the bolt carrier group and gas rings tube are good..the load seems right.. full length size and load 10. i bet they shoot better. give your chamber area a good deliberate scrub out too. any chance you might have some qtip in the gas tube or carrier key? all in all i bet oyu will fix it with the FL sized brass. good luck post up the solution when you get it.
cheers,
doc

 

[300 RUM]

Already loaded up 20 rounds to test fire in the AM, I sure hope that is the only problem. Well see will post results ASAP.

 

[rcw3]

300RUM

With the information currently supplied it is hard to do much else but speculate on what is going on.

If you do not have good results tomorrow then I have four questions to help narrow down some issues:

Does it cycle fine with other loads and ammo?

What's the length of the barrel?

Does it have standard or extended porting (or something else)?

What's your port diameter?


Robert

 

[300 RUM]

This AR is a stock "Bushmaster" with a 16" barrel. I looked for my head space "go/no go " gauge and seem of of lost them, but I did measure the case head space of the current ammo and it is .005" longer then the cases that I sized and loaded today.

 

[rcw3]

300 RUM

Best of luck with your test firing today.

We run into questions like yours periodically from our customers and many times it is a re-loaded ammo related issue. We even made an info page on our website to address some of those issues (i.e. see "Rules for Reloading" section). Here's the link to it:
http://www.6mmar.com/Info_Page.html

I think you are probably on the right track.

Robert

 

[300 RUM]

Ok just test fired the 20 rounds, they worked flawlessly !!! I shot 3 one after another and then just went for it boom, boom, boom, boom, boom, boom, boom, boom, boom, boom awh! what a lovely sound.

I went and measured all/most of my loaded ammo and found that they are mostly for my competition AR-15, I could swear I had some F/L sized in the box? But glad to of found the problem!

 

[navyrad8r]

Sweet
Cheers,
Doc