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uscbigdawg

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Posts posted by uscbigdawg

    Colt 6940

    in Rifle - Technical

    Posted

    As a Colt owner, I'll say they're highly overrated. This one definitely has all the "cool", mall ninja's drooling I'm sure. Nothing wrong with it for 3-Gun, but just not for me. Carbine gas system is okay and the harshness is mitigated with a comp.

    I have 2 Colt lowers only 'cause they're registered in this state. I'll definitely never buy another.

    Rich

    69 SMK

    in Rifle/Shotgun

    Posted

    Butch - Look at some of the fast powders too: H335, W748, et. al.

    I too am looking at alternatives to Varget for my 69gr. load as I'd rather save my Varget for my 308.

    Rich

    Physics of a compensator

    in Open Pistols

    Posted

    Nick - Nothing wrong with a Trubor. Frankly if I were to have a "bare bones" entry level Open gun, I'd go with probably one of Brazos SC pistols. Maybe 2 ports through the top, but that's a big maybe.

    Next time you see him, ask Max to see his pistol. Pretty basic and he does alright. ;)

    Again...it's personal preference.

    Rich

    TIGHT JP Chambers - Which Sizing Die for 650?

    in Rifle - Technical

    Posted

    I'm with JJ.

    All I do is (with clean brass) is spray with Dillon case lube, shake 'em up (about 50-100 or so in a box and 2-3 sprays), toss it in the hopper and load. Tumble the lube off and then gauge in my JP case gauge.

    At setup, the sizing die is touching the plate and then a little "eh" more to give it that little extra.

    No jams or issues.

    Rich

    Physics of a compensator

    in Open Pistols

    Posted

    Nick - I'll tell you this from my Open gun, to probably the other extreme, our buddy Mike's. I have a 4 port hybrid barrel, 3 port comp and 2 side ports through the slide (i.e. a Rusty Kidd 5" Viper). It's awesome, but needs gas in order for it to run happy. It was designed under the old power factor and shot like a dream. When they dropped the power factor, the gun ran sluggish with 124's and N350 loaded down to 168 PF. I then switched to 115's, increased the powder charge, dropped the recoil spring weight and it was a LOT better. The thinking there was to increase the gas volume by pushing a lighter projectile at the same speed. After going back and forth, the reality is that my gun likes 124's (more accurate with them) and I just load them at 173-174PF. I don't ever worry about making major and the gun still feels "light" compared to the old PF. The gun is VERY loud, powder is burning every where (ask anyone that's RO'ed me) but it's flat.

    Now...Mike's pistol is a 5" gun with only a 3 port comp. He shoots either 115's or 124's (can't remember) and N105. The gun is VERY smooth and the dot tracks great. If I were to build a new gun, I'd be hard pressed to not consider this as I can tell you that in using his pistol, I could call my shots cleaner and had better accuracy and follow through. Less violent than mine. Why don't I switch to something similar? I like how fast my gun cycles.

    So...with what you have, talk to Mike and he'll guide you down the right path. At the end of the day, go with what feels right. You know what you like/dislike. Try out every open gun you get your hands on. We talk theory, design, etc. 'til the cows come home, but ulitimately, it's what you prefer.

    Rich

    Physics of a compensator

    in Open Pistols

    Posted · Edited by uscbigdawg

    Nick - All you need to know are two things. One is the Venturi jet principle (this will take care of all your port design questions). The other is that in open guns, you need to go against some old reloading mantra. The old adage in reloading was to burn the last kernel of powder when the bullet is at the muzzle. This (theoretically) made the load more efficient and you were not wasting components. In open guns, we want slower powders as we want as much gas as you can get (personal preference) in order to have some combustion out in front of the muzzle. More gas being created = more gas that engineering in the pistol can use to reduce muzzle rise and torque.

    As for #2 - where Johnny cut back the slide it is a simple thing for a guy that shoots a Fat Free. If you reduce reciprocating mass the gun will shoot a little faster and flatter. So, by having more comp and less slide he's dropping the weight of the slide as well increasing the non-moving weight out at the muzzle (i.e. the furthest point from your hand and having a greater overturning moment [physics] to reduce muzzle rise).

    Hope that helped.

    Rich

    ETA: As for the little nub at the end of the comp, some folks think it helps to stabilize the bullet.

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