Hunting Washington Forum

Equipment & Gear => Guns and Ammo => Topic started by: shocking300 on November 19, 2011, 08:50:58 PM

Title: 30 cal 180 sierra matchking
Post by: shocking300 on November 19, 2011, 08:50:58 PM: Looking on sierra website it shows a 175 gr 30 cal matchking bullet got better ballistics then 180 gr matchking bullet, i was under impression that heavier bullets better ballistics am i wrong?
Title: Re: 30 cal 180 sierra matchking
Post by: wraithen on November 20, 2011, 01:35:51 AM: Depends on a huge amount of stuff. It may be possible that the heavier bullet hit the tipping point between efficiency and initial speed. Could also be their test setups. :dunno:
Title: Re: 30 cal 180 sierra matchking
Post by: high country on November 20, 2011, 06:52:12 AM: Bc is a measure of a bullets resistance to drag. The less drag, the less outside (wind-air) effect. If you start two bullets, one a 220 gr roundnose and the other a 210 gr berger vld at the same speed, the berger will waste it down range. Now give the round nose a 300 fps headstart....the berger will pass it in a couple hundred yards.....all because it is "slicker". The downside to high bc bullets, is they tend to be long and slow twist guns will not always stabilize them.
Title: Re: 30 cal 180 sierra matchking
Post by: shocking300 on November 20, 2011, 08:25:32 AM: i understand different bullets type and construction but these are the same type, construction bullets, emails to sierra were not returned :dunno:
Title: Re: 30 cal 180 sierra matchking
Post by: Jerbear on November 20, 2011, 08:34:21 AM: Call them on their 800 number. They will talk to you and explain it to you.
Title: Re: 30 cal 180 sierra matchking
Post by: high country on November 20, 2011, 09:41:39 AM: Have a peek at the meplat and ogive of the two.....should explain it all.