Reloading Podcast 244 - Grab that powder and get loading

Hello, and welcome to the Reloading Podcast here on the Firearms Radio Network.  

Tonight the guys are helping you figure out powder choosing methods.

  1. Matthew Schinzing
    Any suggestions on the best way to choose between powders in a c  aliber. Specifically between reloader 15 and cfe223 in 6.5 grendel pushing a 129gr pill. I’m using a 16” barrel so I think a faster burn rate would be better but I don’t know how they compare.

  2. Greg Lacey posted in RLPG
    Looking for powder recommendations for 6.5 Grendel. I am using Varget under a 120 gr Hornady ELDM. I am getting around 2350 ft/sec. I am wanting to get the velocity up to decrease wind effect at longer distance. What powders are giving good accuracy and velocity with 120 and 130 gr bullets? Also hoping to have good temp stability.

    If I am able to get the performance out of them I am also looking to step up to a 130 gr pill. Have looked through several reloading manuals, but not wanting to try every powder in there. So far my short list for 130s is: IMR 8208 XBR, Win 748, BLC-2, and Accurate 2520.

    Thanks for your input!

  3. Tim Denton RLPG
    I finally got to listen to your podcast 243 today and I was listening to your discussion about the guy not hitting the target at 700 yards but grouping quit nicely at 500 yards. So it made me start thinking about the transition into and out of Mach also known as transonic. Transonic happens in between 0.8 and 1.2 Mach (Amazing I remember this from my Aerospace college years lol). So depending on the object "bullet" he is in transonic between 900 and 1350 ft/sec. Now this is at sea level, 64 degrees F and in dry air and I did check myself with wikipedia. As a side note our pilot instructors call the transonic area "Where Elvis lives" and you don't want to stay in that area very long it would shake your plane a lot. Well I hope this helps and keep up the great work guys I really enjoy the podcast.

  4. Zack Gates  RLPG 17 Mar 19

    37.6 but SD was 11.5. Seating depth was 2.200. Could changing seating depth make my SD better? Shooting 6.5 CM with 140 gr Berger elite hunters.

Cartridge Corner Notes:375 Winchester


The .375 Winchester was released in 1978 as the initial chambering for Winchester’s Big Bore 94 lever action rifle. The .375 was a revised high power version of the .38-55 Winchester-Ballard black powder cartridge which, in 1894, was one of the initial chamberings of the then new Winchester M94 lever action rifle.

Designed byby U.S gunmaker Charles H Ballard; historical authorities generally agree that the .38-55 Ballard was first introduced in 1884. Ballard’s first major innovation was the creation of an extremely well designed single shot rifle action. After patenting his action in 1861 Ballard sold the rights to use his design to various gun makers. In 1875 John M Marlin adopted the Ballard action which was used as a basis to build accurate rifles. In 1881 Marlin formed the Marlin Firearms company and it is around this time period that the first references can be found of the .38-55 Ballard proprietary cartridge being offered in the Marlin single shot No.4 Perfection.

The .38-55 Ballard earned a reputation as an extremely good cartridge for target shooting out to 300 yards. It was smaller than some of the more common bores in use at that time but produced a good trajectory and low recoil. The most common load consisted of a 255 grain .375 caliber bullet at 1200fps.

With the continued popularity of the .38-55 Ballard, Winchester adopted it as one of the two initial chamberings for their new M1894 Winchester rifle. This rifle is now most famous for its .30-30WCF chambering. After its adoption by Winchester the .38-55 cartridge later came to be called the .38-55 Winchester-Ballard but was also sometimes referred to as the .38-55 Winchester or simply the .38-55 as it was not usually confused with other chamberings. After the turn of the century many of the old black powder cartridges lost popularity as hunters switched to bolt action rifles and bottle necked rimless cartridges. Winchester eventually dropped the .38-55 chambering. Even though its popularity was limited, it continued to maintain a small following amongst black powder cartridge fans which still exists today.

The 1960’s was a time of great creativity, though it was also at this time that Winchester began to instigate cost cutting changes. Nevertheless in 1963, in an attempt to modernize the lever action rifle, Winchester released the Model 88 lever action rifle chambered for the .284 Winchester cartridge. The .284 cartridge was a flat shooting and hard hitting 7mm, a great all-round cartridge, however sales of this rifle were poor and the M88 was soon dropped from production.

From the poor reception of the M88, Winchester designers came to the conclusion that the success of lever action rifle sales depended on classic designs. In 1978 Winchester released a new rifle and cartridge based on these principles. The new rifle was simply a beefed up stronger version of the original M94 lever action rifle and was named the Big Bore 94. Along with the revised rifle came a revised version of Winchester’s original M94 .38-55 chambering, the .375 Winchester.

Winchester factory loads for the .375 featured a 200 grain flat nose Powerpoint bullet at an advertised 2200fps and a 250 grain Powerpoint bullet at 1900fps. These velocities were recorded in a 24” test barrel and true velocities from 20” barrels were more in the region of 2100 and 1800fps respectively.

In 1981 the Winchester company was sold and renamed as the U.S Repeating Arms Company (U.S.R.A.C). Along with this change of hands came modifications to the Big Bore rifle (1982) incorporating side ejection to facilitate the mounting of a scope. The modified rifle was named the Big Bore XTR AE (angle eject). Two new Big Bore cartridges were also introduced at this time, the .307 and .356 Winchester, these were part of Winchester’s original intention to create a family of potent, high pressure cartridges for the Winchester lever action rifle.

Also at this time a fourth .400 caliber cartridge waited in the wings. But contrary to the hopes of the designers all three Winchester cartridges (.307, .356, .375) failed to obtain any lasting popularity. The .375 caliber rifle was the first to fall from production and by the mid 1990’s the .307 and .356 caliber rifles were also discontinued. Today these cartridges enjoy a small and quiet following amongst fans of unique lever action cartridges. Winchester continue to produce one of the two original factory loads for the .375, the 200 grain Powerpoint.

In comparison to the original .38-55 cartridge case, the .375 has thicker case walls and a stronger head. The case is .65” shorter than the .38-55, an odd decision as this potentially allows the .375 rated at 50,000CUP to be accidently chambered in a .38-55 caliber rifle, the .38-55 being rated at 30,000CUP. Due to the fact that the .38-55 case is longer than the .375, it is unsafe to fire .38-55 ammunition in the big bore rifle. That said, a small number of Big Bore rifles were reamed to .38-55 and stamped 38-55/ .375 Winchester. These rifles, of which I have owned one, can fire both ammunitions safely.

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