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M30 170grn FMJ-BT Update
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Goosic View Drop Down
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    Posted: August 28 2023 at 7:12am
I went to the range yesterday morning to evaluate the accuracy of the .3115" 170grn FMJ-BT projectiles using my Custom No4 Enfield. The first shot/Cold Bore shot was high but, I figured it would be. Made the appropriate adjustments and got busy putting holes in paper. I shot a total of 30 rounds or three, ten shot groups. The averaged MV was 2558 fps so, very close to MkVIIz velocities. It should be noted here that, the M47C BSA barrel is a very lightly used example with an average land to land bore reading of .3025". The evaluation puts these 170grn FMJ-BT projectiles on par with the 174grn projectiles as well as the 168grn .308" projectile. The only other conclusion is that these projectiles are 6 cents cheaper per round to shoot than the 174grn SMK projectiles.
Post Script: The video does not quite show it but,, the rifle definitely has a "Kick" to it...
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Points: 4021 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Canuck Quote  Post ReplyReply Direct Link To This Post Posted: August 31 2023 at 7:52am
This I like! Range time is fun time!
Castles made of sand slip into the sea.....eventually
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Points: 16998 		Post Options Post Options   Thanks (0) Thanks(0)   Quote A square 10 Quote  Post ReplyReply Direct Link To This Post Posted: August 31 2023 at 9:20pm
i love that spotting wscope - please enlighten us as to what it is and its history if you will , 
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Very nice rifle and I love your spotting scope.  I'm wondering about your cartridge designation.  You mentioned your round approximated the MkVIIZ (7Z) at 2,550 fps.  It was the MkVIIIZ (8Z) round that had a muzzle velocity of 2,550fps, not the 7Z.  The 7Z cartridge was loaded with DuPont No. 16 nitro cellulose powder and was so named to differentiate it from the cordite loaded MkVII round.  Although the two rounds used different powders their muzzle velocities were very similar. 


 
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Sapper740: I have alot of original 1941', 42', and 43' Winchester MkVIIz ammunition and chronographed 48 rounds of the 1943 lot and the averaged MV was 2545 fps so I used that information in comparison with my new test rounds...
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"Mk2S Scout Scope" & tripod if I'm guessing correctly?
Don't shoot till you see the whites of their thighs. (Unofficial motto of the Royal Air Force)
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Originally posted by Shamu Shamu wrote:

"Mk2S Scout Scope" & tripod if I'm guessing correctly?
The bigger one is. It is electro stenciled: TELE SCT REGTS MKII s HCR & SONS Ltd  OS 126 GA 7862
The tripod is stamped STAND INSTRS No21 MkV NEW ZEALAND  8754 with a broad arrow.  I can find nothing on the smaller telescope...
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cool , it has "that look" of vintage i figured it was something commonwealth - pretty nifty tripod as well , thanks for the enlightenment 
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I use them as they were intended to be used and they are definitely the conversation starter at the range. The clarity of the telescopes are amazing which is why I use them over the store bought brand spotting scopes...
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Originally posted by Goosic Goosic wrote:

Sapper740: I have alot of original 1941', 42', and 43' Winchester MkVIIz ammunition and chronographed 48 rounds of the 1943 lot and the averaged MV was 2545 fps so I used that information in comparison with my new test rounds...


All the Mk 7 and 7z ammunition I have chrono’ed thru several different No. 4 rifles (20 feet from muzzle) gave velocities in the range 2430 to 2450 fps. The specification velocity for the Mk 7 cartridge (both 7 and 7z) was 2440 fps.  If you’re getting 2545, I suspect either an issue with the chrono, the powder has deteriorated giving higher pressures/velocities (which can happen), or the Winchester quality controls were poor on those lots.
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Originally posted by britrifles britrifles wrote:

Originally posted by Goosic Goosic wrote:

Sapper740: I have alot of original 1941', 42', and 43' Winchester MkVIIz ammunition and chronographed 48 rounds of the 1943 lot and the averaged MV was 2545 fps so I used that information in comparison with my new test rounds...
All the Mk 7 and 7z ammunition I have chrono’ed thru several different No. 4 rifles (20 feet from muzzle) gave velocities in the range 2430 to 2450 fps. The specification velocity for the Mk 7 cartridge (both 7 and 7z) was 2440 fps.  If you’re getting 2545, I suspect either an issue with the chrono, the powder has deteriorated giving higher pressures/velocities (which can happen), or the Winchester quality controls were poor on those lots.
The actual test here was to determine if the 170grn FMJ-BT projectiles are "As accurate or Better" than the 174grn FMJ-BT projectiles. The test shows that the 170grn projectiles can produce tighter groupings on average, sometimes. The original control group of 174grn FMJ-BT projectiles had an averaged MOA of 1.5 whereas the 170grn FMJ-BT projectiles had an averaged MOA of 1.25. I never achieved an actual "Minute of Angle" grouping with either the 174grn or 170grn projectiles. 

The conclusion here is that; #1: The 170grn .3115" projectile can be made to be very competitive against the 168grn 7.62/.308 shooters. #2: If, you are one of those types that are forever chasing those smaller and tighter groups on the range using a No4 Enfield with an unknown number of rounds shot through it then, the .3115" 170grn FMJ-BT projectiles are highly recommended over that of the .311" 174grn projectiles. #3: For the everyday target shooter, they are 6 to 8 cents cheaper than the Sierra bullets, depending on who you buy from so there is that...

Post Script: (The test rifle used for both projectiles is the one being described here.)The M47C BSA barrel on the No4Mk1/2 Maltby reciever was sourced on-line with no known history of a round count. Projected or otherwise. Using a bore gauge, it measures out at .302" between the lands of the rifling...
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What make of bullet is this? I’ve not come across a 170 gr .3115 bullet before. Who sells them? Would like to try these out. 
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Originally posted by britrifles britrifles wrote:

What make of bullet is this? I’ve not come across a 170 gr .3115 bullet before. Who sells them? Would like to try these out. 
7.62x54R projectiles come in a variety of weights.  I chose the 170grn variety for the simple reason of it being a go-between of the 168grn .308 and the 174grn  .303...
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