Actual Berger B.C.

Jakeweb09 · Sunday at 6:38 PM

It's a completely different powder, in a completely different barrel..velocity could be very different. Even when burn rates are the same the energy might be completely different. Resulting in significant velocity changes, plus some barrels run fast, some run slow. Check it with this actual load.

Marksman LLC · Sunday at 6:39 PM

How confident you have a perfect zero? That's where I would start, then make sure your velocity is right. Berger bc is usually dead on or really close to advertised.

Kyote2388 · Sunday at 7:16 PM

Rifle is zeroed at 100 yds dead nuts on or its as close I an my imperfections can get it, been using 4831 in the 25-06 and now the akley version, have shot nothing else since I found a powder that works well for speed and accuracy. Its a real deer slayer and I am not necessarily going to be shooting deer at 750 or more but I do like shooting paper.

lancetkenyon · Sunday at 7:49 PM

Garbage in, garbage out.
Your inputs have to be WAY off.
If you are guessing at any inputs, your solution is a crapshoot.

Kyote2388 · Sunday at 8:51 PM

Not a lot of guessing, gun zeroed at 100 bullet drop 115 in at 750 yd, and when I dial .72 as bc into the scope its on, I am curious as to why such a crazy bc number from published data, thinking there is a bug in the scope firmware. Its pretty strait forward I just kept adding to the bc number because it was getting closer everyime I bumped it finally .72 Bingo. It is what it is.

6.5saum/300rum · Sunday at 9:04 PM

Kyote2388 said:
Not a lot of guessing, gun zeroed at 100 bullet drop 115 in at 750 yd, and when I dial .72 as bc into the scope its on, I am curious as to why such a crazy bc number from published data, thinking there is a bug in the scope firmware. Its pretty strait forward I just kept adding to the bc number because it was getting closer everyime I bumped it finally .72 Bingo. It is what it is.

You are guessing about your muzzle velocity. Bergers bc is very close normally with my experience it's not going to be almost double what they claim. Something else is off. Start with checking your muzzle velocity and then we can go on from there.

JAYgs8163 · Monday at 3:34 AM

Stated BC is accurate from Berger. Operator error or scope is broke.

FEENIX · Monday at 4:17 AM

JAYgs8163 said:
Stated BC is accurate from Berger. Operator error or scope is broke.

Per my responses on #8 and 11, I am also leaning toward this and Lance's stance.

JiminAZ · Monday at 8:20 AM

If you really want to do this without knowing your MV, I'd say put the Berger published BC in and then adjust MV until your drop at 750 matches.

338 dude · Monday at 8:29 AM

Kyote2388 said:
Shooting 25-06 AK 7.5 twist , using 115 Berger VLD at 3,200 fps. I have programed a Burris Eliminator for this gun with factory loads before I put the new barrel on by using 750 yd drop number and published b.c. I just finished programming the scope with my 115 gr reloads, it was a struggle. I found my 750 yd drop number and entered the published b.c for the bullet, .483. I couldn't hit spit close or at distance. Finally expanded my distance target and figured out I was way high and way low at close range. Tweaked with the programed b.c. and got the scope shooting good now. I had to use a b.c. of .72 to make the scope hit correctly. Curious if there is any idea as to why the programed bc could be so far off the stated bc.

FEENIX · Monday at 8:57 AM

JiminAZ said:
If you really want to do this without knowing your MV, I'd say put the Berger published BC in and then adjust MV until your drop at 750 matches.

If the "actual" drop at 750Y is -115" the MV is 3228 FPS at zero altitude.

Actual Berger B.C.

Jakeweb09

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Marksman LLC

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Kyote2388

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lancetkenyon

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Kyote2388

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6.5saum/300rum

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JAYgs8163

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FEENIX

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JiminAZ

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338 dude

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FEENIX

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