After a couple of scope problem days at the range I finally made it to test loads with everything working just right. The new 470 Mbogo is a definite shooter. Here are the results.Both targets were shot at 100yards
The three Swift A-Frames measure .730, the two GS custom solids measure .590 and the 540 Bridgers are too low in comparrison to the Swifts but measure 1.64.

This target shows three Barnes X that din't really work out but the three GS customs did work out well. I only had five to start with. Three in this target and the other two in the first target posted. But if you layed one target over the other the five shot group turned out well. I did try 1 other group with the 540 Bridgers and it turned out well but too low in comparrison to the softs.I think a five hundred grain Bridger is a must to try.

All in all a good first day out.
Take good care,
Dave

[ 04-19-2003, 10:26: Message edited by: 470 Mbogo ]

Well 470, looks like you've got yourself a shooter! Just wait'll that baby gets broke in!

470 Mbogo,

Well, it's looking good. The buff are definitely in trouble now. Since you no longer need that old rifle just send it on down for a long term test, and I promise to let you know how it's doing from time to time .

Good shooting,
Jim

470MbogoDave,
Thanks for sharing. Post the load data when you get it worked out, and it will save me some time and trouble, not to mention powder, primers, and bullets.

It seems the 16" twist might not be fast enough for 540 grain bullets, and the impact point is too different from the 500 grainers. A fair comparison for the Bridger bullet would be to use the 500 grain Bridger, eh?

Hi Ron,
The other group that I shot with the 540 Bridgers measured 1 inch. I think the 500 Bridger is a must try. I'm going to chronograph the 500 GS solids and see what they are doing. They may be slower due to the moly coating. If so I'll speed them up a bit and see if the POI comes closer to the Swift A-Frames. I don't think it's the twist rate with the 540's. The velocity is 100 fps slower and the bullet 40 grains heavier so that could justify the lower point of impact.
Take care,
Dave

Nice pics Dave. You can sure see the difference in the holes made by the GSC and Bridger "cookie cutters"!

I think that the .410 meplat is also probably impacting the BC somewhat. Not exactly the most aerodynamic shape (in relation to the softpoints), although external ballistics is not what it is designed for.

Cheers,
Canuck

It shouldn't make that muke of a difference would it? It is only 100 yards.

You wouldn't think so.

The GS Customs are just as flat in the nose as the Bridgers but are 500 grain. So it is possible that the point of impact is just the nature of barrel harmonics and the exit timing of the bullet. I would think that the BC would have to make some of the difference at 100 yards because at 200 it's probably substantial. I haven't checked the velocity with the GS customs yet but did load them with the same powder load. With the coating and design it's possible that they are going a bit slower.
Take care,
Dave

Dave,

I never did ask, what is the width of the meplat on the GSC? I could go measure the sample you left with me, but it is still in a box somewhere!

Cheers,
Chris

Actually, I managed to find it pretty quickly. The GSC is about .310 before the "ogive" (where it is rounded off at the edge of the meplat), and .405 where the "ogive" ends and it begins its straight taper to .475. So I guess it isn't too different from the Bridger, although it might be slightly more "aerodynamic". I can't really picture these differences adding up to inches at 100 yds, but ???

Canuck