R25's freebore length (leade) and throat angle?

More
11 years 11 months ago #15965 by fivewhy
R25's freebore length (leade) and throat angle? was created by fivewhy
I am wondering if there is a chamber print or other publication denoting the i) freebore length (leade), ii) throat length, and iii) throat angle of the stock R25 chamber for the .308 cal. I recognize that I can do a chamber cast to measure this for my specific rifle, and this is exactly what I will ultimately have to do. For now, I am just looking for some publication of this data...if there is any. If there is nothing that is specific to the Remington, is there anything that is specific to the AR10 platform (as opposed to the SAAMI standard for .308)? I am by no means a seasoned veteran as to handloading, so I appreciate any and all guidance....particularly if I am being a dumbass about something (I'd rather a person tell me I'm a dumbass than have my weapon and rounds tell me I'm a dumbness...). Thanks.

Sidenote: I am defining the freebore length as the space between the forward end of the case neck (meaning, the very forward/front end of the headspace measurement) and the beginning of the barrel throat. I do not include the throat length in the measurement of the freebore length.

Please Log in or Create an account to join the conversation.

More
11 years 11 months ago #15969 by jtallen83
Replied by jtallen83 on topic R25's freebore length (leade) and throat angle?
I'm not sure there is a set number, at least for loading purposes. I know bolt guns I've loaded for in the past had different numbers to bet the same bullets to touch lands, I'm betting you'll find the same with AR's. I haven't loaded for my AR-10 yet but I've been reading everything I can, seems like fitting the magazine for reliability is the main factor on bullet depth, I haven't read of anyone that was able to load anything to long and still function. some bench-rest guys talk about using the rifle like a single shot so the can put the depth where they want.

Please Log in or Create an account to join the conversation.

More
11 years 11 months ago #15973 by LebbenB
Replied by LebbenB on topic R25's freebore length (leade) and throat angle?
For that sort of info, I'd say contact Remington. If you're going to continue to research on your own, also research DPMS and Bushmaster .308 rifles since all three companies are currently owned by Freedom Group.

Please Log in or Create an account to join the conversation.

More
11 years 11 months ago - 11 years 11 months ago #15976 by fivewhy
Replied by fivewhy on topic R25's freebore length (leade) and throat angle?

jtallen83 wrote: seems like fitting the magazine for reliability is the main factor on bullet depth

I completely agree with that statement. I do not believe that I would be able to feed a round thru the mag well (or fit in the mag) that I have extended so far as to come close to the lands...at least not in a stoner chamber. I'd be left with a single shot action that I have to feed through the breech (well, ejection port). However, it enheartens me to know that this is where your mind went in response to my question (means I'm not too far off my rocker). I am just going to have to get around to doing a good chamber cast one day, though I will def try to call up Remington or DPMS (they make the upper, apparently). My goal is just tinkering/thought-experiment type stuff, and getting to know my rifle.
Last edit: 11 years 11 months ago by fivewhy.

Please Log in or Create an account to join the conversation.