Palladan44
Member
- Joined
- Nov 7, 2020
- Messages
- 1,903
I've read all about the similarity between these 2 calibers, and I've used both of them for many years (357 a lot longer) I've never personally fired them side by side to determine 1) which one might have the slight edge in power (more specifically Muzzle Energy) and 2) which one can group better at your common handgun hunting distances (slow braced and off hand Bullseye fire, and fired in cadence in approximately 1 second intervals (simulated follow up shots possibly in a self defense situation out in the wild, or elsewhere)
The 8" barreled guns (Banshee and S&W M27-2)will be fired to determine velocity/energy only as the guns aren't a fair fight with one another as far as accuracy/quickness.
The primary focus will be the 6" guns (Glock 40 MOS and S&W 586 no dash) as these are my 2 most common ones I'd probably take to the field.
The 4" Guns, Glock 20 and Colt Python (Gen2 circa 1978) will be tested in all domains as well. (I do not hunt with either of the 4" guns, and in some states it may not be legal to do so)
What I will be using is my handloads only. They are what I shoot almost exclusively. I do have a few factory loads for each, and I may test them as well....but probably wont. I have identified 2 different loads that I'd call my "pet" loads for each gun, which I've identified over the years as having top velocity and being quite accurate (The combos will come as no surprise to anyone who knows these calibers....)
Blue Dot and Longshot have proven to be the best powders for 10mm to achieve maximum performance. That is that.
WW- 296 has been an old stand by for my Jacketed 357 Magnum hunting loads since the beginning of my handloading days, and more recently have discovered Alliant Power Pro 300-MP able to edge out WW-296 in longer barrels, although by a very thin margin.
I suppose in order to make the contest truly Apples to Apples, I would use the same grain weight bullets for both guns....however this will not be the case either. I will instead be using "the standard for caliber" weighted bullets. I can argue that putting 180 grain bullets in the 357 magnum, which are "heavy for caliber" will sway to the advantage of the 10mm. Also, the loads I've developed for the 357 Magnum over the years have been almost exclusively 158gr. And exclusively 180gr. bullets in 10mm. They are what I have, what ive developed, and they are the "standard" weights for the calibers, or at least around here.
10mm loads:
1)Starline Nickel Brass, 180gr Hor. XTP, Blue Dot @ 11.0gr OAL- 1.252" CCI-LPP
2) Starline Nickel Brass, 180gr Zero JHP, Longshot @ 9.5gr. OAL- 1.253" CCI-LPP
357 Loads:
1) F-C Nickel Brass, 158gr. Speer Deepcurl JHP
WW-296 @ 16.7gr. OAL- 1.575" CCI-SPM
2) F-C Brass, 158gr. Speer Deepcurl JHP
Alliant 300MP @ 18.6gr. OAL- 1.575" CCI-SPM
Again, this is just an experiment performed by me...a less than perfect human being. I'm not a professional. All of these loads have been worked up by me using a ladder, and have proven safe in my firearms. Do not replicate this load information. These are published loads, however are maximum published loads and should not be replicated unless first worked up slowly from the starting charge published in your manual.
Will execute this experiment the next range visit in the near future. Will provide chrono results and calculated muzzle energies, accuracy at 20 yds shot from both braced (to simulate my real world hunting rest) and off hand..will do quicker firing at 10 yds just to make sure I don't miss paper and hit the hangers.
The 8" barreled guns (Banshee and S&W M27-2)will be fired to determine velocity/energy only as the guns aren't a fair fight with one another as far as accuracy/quickness.
The primary focus will be the 6" guns (Glock 40 MOS and S&W 586 no dash) as these are my 2 most common ones I'd probably take to the field.
The 4" Guns, Glock 20 and Colt Python (Gen2 circa 1978) will be tested in all domains as well. (I do not hunt with either of the 4" guns, and in some states it may not be legal to do so)
What I will be using is my handloads only. They are what I shoot almost exclusively. I do have a few factory loads for each, and I may test them as well....but probably wont. I have identified 2 different loads that I'd call my "pet" loads for each gun, which I've identified over the years as having top velocity and being quite accurate (The combos will come as no surprise to anyone who knows these calibers....)
Blue Dot and Longshot have proven to be the best powders for 10mm to achieve maximum performance. That is that.
WW- 296 has been an old stand by for my Jacketed 357 Magnum hunting loads since the beginning of my handloading days, and more recently have discovered Alliant Power Pro 300-MP able to edge out WW-296 in longer barrels, although by a very thin margin.
I suppose in order to make the contest truly Apples to Apples, I would use the same grain weight bullets for both guns....however this will not be the case either. I will instead be using "the standard for caliber" weighted bullets. I can argue that putting 180 grain bullets in the 357 magnum, which are "heavy for caliber" will sway to the advantage of the 10mm. Also, the loads I've developed for the 357 Magnum over the years have been almost exclusively 158gr. And exclusively 180gr. bullets in 10mm. They are what I have, what ive developed, and they are the "standard" weights for the calibers, or at least around here.
10mm loads:
1)Starline Nickel Brass, 180gr Hor. XTP, Blue Dot @ 11.0gr OAL- 1.252" CCI-LPP
2) Starline Nickel Brass, 180gr Zero JHP, Longshot @ 9.5gr. OAL- 1.253" CCI-LPP
357 Loads:
1) F-C Nickel Brass, 158gr. Speer Deepcurl JHP
WW-296 @ 16.7gr. OAL- 1.575" CCI-SPM
2) F-C Brass, 158gr. Speer Deepcurl JHP
Alliant 300MP @ 18.6gr. OAL- 1.575" CCI-SPM
Again, this is just an experiment performed by me...a less than perfect human being. I'm not a professional. All of these loads have been worked up by me using a ladder, and have proven safe in my firearms. Do not replicate this load information. These are published loads, however are maximum published loads and should not be replicated unless first worked up slowly from the starting charge published in your manual.
Will execute this experiment the next range visit in the near future. Will provide chrono results and calculated muzzle energies, accuracy at 20 yds shot from both braced (to simulate my real world hunting rest) and off hand..will do quicker firing at 10 yds just to make sure I don't miss paper and hit the hangers.
