MY 25 X 47 LAPUA ODCR CUSTOM BUILD & LOAD WORK-UP

[B23]

UPS says delivery on these tomorrow. So I will re-test them and see how they look on paper. Probably gonna be hard to out-perform the Bergers but we will see soon.

Well, just realized I have a bad batch of these Sierra 131 gr. MK bullets. Should have measured this before I started loading but I measured from base to tip. Was checking to see if my lands had moved back with the Wheeler Method and saw shorter numbers than I originally saw up front. Deductive reasoning says that my chamber is not shrinking so I started looking elsewhere. Measured 20 bullets that I was about to load and realized the variance was a whopping .010 from base to ogive over the 20 count. Seating bullets measuring from case base to ogive with Sinclair tool but unfortunately that will not correct the issue. Stopping with this bullet and going to Berger 135 gr. LRHT.

Did they say or give any Lot#'s that were affected by this bad batch of 131 MK's. I bought some back when they were available just to have but they've been sitting on the shelf since getting them. I think I opened a box just to look at them then put them on the shelf. Maybe I should go measure some and see if any I have are from the bad batch.

 

[Bill Norris]

Did they say or give any Lot#'s that were affected by this bad batch of 131 MK's. I bought some back when they were available just to have but they've been sitting on the shelf since getting them. I think I opened a box just to look at them then put them on the shelf. Maybe I should go measure some and see if any I have are from the bad batch.

No info given on how many or lot numbers were bad.

 

[B23]

I measured the ones in the box I had opened (015835962) and with my 25 cal comparator they were .7365 - .7390 base to ogive and the bullet OAL ranged from 1.4130 - 1.4175 I didn't open the other box (015835933) and measure any of them but maybe I should.

There was a partial box of Hornady 134's on my bench so I grabbed a handful of them and they were all .7515 base to ogive except one that was .7505 and their OAL was 1.455 - 1.4555.

For fun grabbed a handful of 138 A-Tip they were all dead nuts .7640 base to ogive and OAL 1.461 with one being 1.4065

 

[Bill Norris]

Sounds like yours is in fair shape then.

 

[Bc'z]

Just noticed your stock looks identical to mine on my 260AI.

That's the stock I sent you pictures of and told ya I thought yours would look better red. Lol
One of these days I'll do a red 1 for ya.

 

[Bill Norris]

That's the stock I sent you pictures of and told ya I thought yours would look better red. Lol
One of these days I'll do a red 1 for ya.

Sounds like a plan but I'm not completely over the idea of Black fading into Silver yet. LOL.

 

[Bill Norris]

Just received the new replacement 131 gr. Sierra MK by UPS. Measured 10 random bullets from base to ogive and found .003 variance between the 10. Much better than the previous batch but will still need to sort to get best results. Re-testing seat depth when weather clears up. Lots of rain today and possibly tomorrow as well.

 

[Bill Norris]

O K, not real sure this bullet will shoot with the Bergers but this new lot is definitely an improvement over the original ones we had. Seat depth went well and this bullet is liking .013 OTL as those original ones had shown us when I stopped testing and M V, E S, & S Ds are more consistent than the others ones as well.

 

[Bill Norris]

Did not abandon this rifle and testing but have been spending my time with the new "Uncle Bill" rifle presented to me last week by Zack (ODCR) and other counter parts who contributed to that cause. Managed to get the scope mounted, bore-sighted and fired the very first and very cool 5-shot group with blowing out brass that measured a cool .093 @ 100 yds. today. Plan to get back to this one soon at 300 yds. when weather cools on down a tad more.

 

[std7mag]

That's the stock I sent you pictures of and told ya I thought yours would look better red. Lol
One of these days I'll do a red 1 for ya.

They never listen...

 

[Bill Norris]

They never listen...

LOL. He did do a RED one for me and it is really nice. The total build is my prize procession now.

 

[357Mag]

Sounds like a plan but I'm not completely over the idea of Black fading into Silver yet. LOL.

Bill-

Howdy !


Fade black to silver ? Did your hair also do that ?!


With regards,
357Mag

 

[Bill Norris]

Bill-

Howdy !


Fade black to silver ? Did your hair also do that ?!


With regards,
357Mag

No Sir, it started out "Red" as a fox and then turned Silver. LOL.

 

[Bill Norris]

Looks like the 25 cal. is making some headway coming back into the sport since the high B C bullets have come onto the scene. Precision Rifle Blog shows some very favorable stats for it.

Best Rifle Caliber: What The Pros Use

I surveyed the 200 top-ranked shooters in the Precision Rifle Series (PRS) to get a detailed look a...

precisionrifleblog.com

Among those in the top 25, 40% run a 25 caliber! 52% were using a 6mm, which was still the majority, but the 25 made up a lot of ground in a single year.

 

[SVT_Tactical]

Did a speed test on mine tonight in low light. Was worried more about the chrono numbers than bullet impact. I'm using HBN coated bullets so I've got add a bit more powder to hit my goal of 2950 min. No pressure signs yet.

 

[Tangent]

The 25 cal seems to be the BC sweet spot for the ~130-140gr bullet weight. 6.5mm seems to suit 140-155gr given sufficient velocity. It reinforces my thoughts that you need to decide what bullet weight you want to shoot first, then find a cartridge that gives sufficient speed to make the most of the BC.

 

[Bill Norris]

Did a speed test on mine tonight in low light. Was worried more about the chrono numbers than bullet impact. I'm using HBN coated bullets so I've got add a bit more powder to hit my goal of 2950 min. No pressure signs yet.
View attachment 1690721

Looks like this combination is gonna work for you too. Both rifles are working best at the upper load range.

 

[Bill Norris]

Got mine back on the bench today and shot a couple groups. One to finally verify the new lot of Sierra 131 gr. replacement bullets and one just to see how my 135 gr. Bergers would act on a cooler day than when I worked up the load in the heat.

Was a tad slower @ .231 5-SHOT GP. 2933 FPS 13 E S 5 S D but still held just under 1/4 inch @ 100 yds. Had about half a bullet hole of vertical but I feel the tuner would probably get that out. I may go back and re-test a small increase in powder to 38.6 gr. just to see how it looks since my barrel now has more rounds on it. My M V was at 2998 FPS when I checked it previously in the powder run up but the tune looked better at 38.2 & 38.4 gr.

The Sierras were still lagging in group size behind the Bergers @ .356 5-SHOT GP. 2954 FPS 18 E S 6 S D with the same powder charge as the load I worked up. Again still need to check the tuner on both loads.

Since the word is fairly common that VV-N500 series powder are tough on the lands I cleaned it and went back in to see if I could find any movement with the Wheeler method and I found the lands to be exactly where they were when I first set up the ogive measurements for loading. But, I don't rapid fire and I allow for cooling between groups as well.

 

[Bill Norris]

These guys took the 25 X 47 out to 1115 yds. recently and was hitting really well with it.

In another video they feel this offspring of the X 47 will be better than anything they have tried in the past shooting NRL.

 

[Bc'z]

Did a speed test on mine tonight in low light. Was worried more about the chrono numbers than bullet impact. I'm using HBN coated bullets so I've got add a bit more powder to hit my goal of 2950 min. No pressure signs yet.
View attachment 1690721

Im not a gambler but I'd bet 39 is gonna knot up.