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You going to do what!?!?

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Goosic View Drop Down
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    Posted: January 03 2020 at 10:41am
Preface: (This works with the Long Branch and Savage rifles that have a two groove rifled barrel that is not extremely worn.)
I love shooting my Enfield rifles. I also enjoy concocting my own personal reloads for them. One particular load involves a 168grn and or a 180grn  .308 diameter BTHP.  What!? Yes,you read that correctly. Many decades ago a professional competition shootist,who was extremely proficient with an Enfield No4Mk1* clued me in on a topic involving Enfield accuracy using a two groove barrel. He found out after extensive research that the LB and Savage two groove barrels are somewhat tighter in the lands to grip the bullet better while still retaining the standard depth of the grooves. He would start out with FL sized .303 brass and then run 0.020" of the opening into a .308 resizing die.Afterwhich,when everything was said and done,he would put a factory style crimp on his reloads. His personal bullets of choice were the 168grn  Sierra Match King. This had the added bonus of reducing chamber pressures,drag coefficients and fouling upon firing. The accuracy between a factory .311 diameter bullet and his .308 reloads showed a slight favoritism to the reloads during testing.(Possibly due to the Boattail design) I have a Long Branch No4Mk1* with a brand new,unissued barrel. The barrel was gauged buy a professional gunsmith and has a bore of 0.3030" and .314" grooves. I currently have 22 180grn .308 Norma Vulkan bullets loaded into 303B Hornady brass. The basic math here indicates that the .308 is close to .005" larger the .303 bore. I have done this before,however. I will make my tests this weekend and share my results with you afterwards.  One of the photos shows how far the bullet will enter the muzzle and another will show what the measurement is at that point. I had my micrometer recalibrated as indicated by yet another photo in this post.
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britrifles View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote britrifles Quote  Post ReplyReply Direct Link To This Post Posted: January 03 2020 at 11:04am
I’m looking forward to seeing the results Goosic.  

The early No. 4 7.62 NATO conversions were done using .303 barrels that had the breech cut back about 1/4 inch and rechambered with a .308 Win chamber reamer.  I’ve got a early 1960’s DCRA instruction sheet on the conversion process.  These rifles shot quite well with good 7.62 ammunition and would have shot even better with match quality reloads.  

Eventually, Enfield and Long Branch made No. 4 service weight 7.62 barrels (I’ve got two No. 4 rifles fitted with these barrels), and later, 4 lb barrels used in the Sniper conversion.   The most accurate No. 4 rifle I have is a conversion with Long Branch made 7.62 service weight barrel which I shoot the 168 gr Sierra MatchKing loaded with 40.0 grains of Varget.  

I can’t recall off the top of my head what rifling was used in the 7.62 barrels. I want to say 4 groove RH 1:10 twist but I may be thinking of the Springfield and M1 barrels.  I know it’s not 2 groove, this was a LB and Savage war time expediency.  


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Post Options Post Options   Thanks (0) Thanks(0)   Quote Goosic Quote  Post ReplyReply Direct Link To This Post Posted: January 03 2020 at 11:16am
 I am going to use both the Long Branch and the Faux T rifle for comparisons. Ten rounds each of the .308 and .311 just to get rid of the bias with new new barrel on the Long Branch. 
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